Objective To compare the difference of gait parameters and symmetry between single-task walking and double-task walking with different types and different loads in community stroke patients. Methods The gait parameters of 20 community stroke patients in chronic convalescence were collected by Simi Motion three-dimensional motion analysis system during single-task walking, cognitive double-task walking and motor double-task walking with different loads, and the symmetry index was calculated indirectly. The single-factor repeated measure variance analysis was used to compare the gait parameters and symmetry differences between single-task walking and different double-task walking. Results Compared with single-task walking, the walking speed, stride length, stride length of affected side and the proportion of healthy side swing in community stroke patients during intervention of high-low load cognitive tasks were decreased (p<0.05), while the proportion of stride width and support of healthy side and affected side was increased during intervention of difficult cognitive tasks (p<0.05), and the proportion of robust stride length and affected side swing was decreased (p<0.05). The symmetry index of oscillating phase proportion decreased (p<0.05). Conclusions Community stroke patients mainly deal with cognitive task interference by reducing walking speed, reducing stride length and stride length, reducing swing proportion, increasing step width and support proportion, and changing gait pattern. For gait stability, the intervention of high-load cognitive tasks will increase the asymmetry degree of swing proportion of community stroke patients and reduce their gait stability.